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DynamoDB 推出了依照時間自動刪除的功能:「New – Manage DynamoDB Items Using Time to Live (TTL)」。

You can enable this feature on a table-by-table basis, specifying an item attribute that contains the expiration time for the item.

這個功能比較特別的是,刪除的 scan 是不收取費用的:

There is no charge for the internal scan operation or for the deletion. You will pay for storage until the item is actually deleted.

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